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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::scoped_allocator_adaptor&lt;OuterAlloc,InnerAlloc...&gt;::</span>construct</h1>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../destroy_at.html" title="cpp/memory/destroy at"><span class="t-lines"><span>destroy_at</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../uninitialized_copy_n.html" title="cpp/memory/uninitialized copy n"><span class="t-lines"><span>uninitialized_copy_n</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../uninitialized_fill_n.html" title="cpp/memory/uninitialized fill n"><span class="t-lines"><span>uninitialized_fill_n</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../uninitialized_move_n.html" title="cpp/memory/uninitialized move n"><span class="t-lines"><span>uninitialized_move_n</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../uninitialized_default_construct_n.html" title="cpp/memory/uninitialized default construct n"><span class="t-lines"><span>uninitialized_default_construct_n</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../uninitialized_value_construct_n.html" title="cpp/memory/uninitialized value construct n"><span class="t-lines"><span>uninitialized_value_construct_n</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../destroy_n.html" title="cpp/memory/destroy n"><span class="t-lines"><span>destroy_n</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../construct_at.html" title="cpp/memory/construct at"><span class="t-lines"><span>construct_at</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../raw_storage_iterator.html" title="cpp/memory/raw storage iterator"><span class="t-lines"><span>raw_storage_iterator</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../get_temporary_buffer.html" title="cpp/memory/get temporary buffer"><span class="t-lines"><span>get_temporary_buffer</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../return_temporary_buffer.html" title="cpp/memory/return temporary buffer"><span class="t-lines"><span>return_temporary_buffer</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 垃圾收集支持</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../gc/declare_reachable.html" title="cpp/memory/gc/declare reachable"><span class="t-lines"><span>declare_reachable</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../gc/undeclare_reachable.html" title="cpp/memory/gc/undeclare reachable"><span class="t-lines"><span>undeclare_reachable</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../gc/declare_no_pointers.html" title="cpp/memory/gc/declare no pointers"><span class="t-lines"><span>declare_no_pointers</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../gc/undeclare_no_pointers.html" title="cpp/memory/gc/undeclare no pointers"><span class="t-lines"><span>undeclare_no_pointers</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../gc/pointer_safety.html" title="cpp/memory/gc/pointer safety"><span class="t-lines"><span>pointer_safety</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../gc/get_pointer_safety.html" title="cpp/memory/gc/get pointer safety"><span class="t-lines"><span>get_pointer_safety</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 杂项</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../pointer_traits.html" title="cpp/memory/pointer traits"><span class="t-lines"><span>pointer_traits</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../to_address.html" title="cpp/memory/to address"><span class="t-lines"><span>to_address</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../addressof.html" title="cpp/memory/addressof"><span class="t-lines"><span>addressof</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../align.html" title="cpp/memory/align"><span class="t-lines"><span>align</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../assume_aligned.html" title="cpp/memory/assume aligned"><span class="t-lines"><span>assume_aligned</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> <a href="../c.html" title="cpp/memory/c">C 库</a></td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../c/malloc.html" title="cpp/memory/c/malloc"><span class="t-lines"><span>malloc</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../c/aligned_alloc.html" title="cpp/memory/c/aligned alloc"><span class="t-lines"><span>aligned_alloc</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../c/calloc.html" title="cpp/memory/c/calloc"><span class="t-lines"><span>calloc</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../c/realloc.html" title="cpp/memory/c/realloc"><span class="t-lines"><span>realloc</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../c/free.html" title="cpp/memory/c/free"><span class="t-lines"><span>free</span></span></a></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> <a href="../new.html" title="cpp/memory/new">低层内存管理</a></td></tr>
</table></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../scoped_allocator_adaptor.html" title="cpp/memory/scoped allocator adaptor"><tt>std::scoped_allocator_adaptor</tt></a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> 成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="scoped_allocator_adaptor.html" title="cpp/memory/scoped allocator adaptor/scoped allocator adaptor"><span class="t-lines"><span>scoped_allocator_adaptor::scoped_allocator_adaptor</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="~scoped_allocator_adaptor.html" title="cpp/memory/scoped allocator adaptor/~scoped allocator adaptor"><span class="t-lines"><span>scoped_allocator_adaptor::~scoped_allocator_adaptor</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator%3D.html" title="cpp/memory/scoped allocator adaptor/operator="><span class="t-lines"><span>scoped_allocator_adaptor::operator=</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="inner_allocator.html" title="cpp/memory/scoped allocator adaptor/inner allocator"><span class="t-lines"><span>scoped_allocator_adaptor::inner_allocator</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="outer_allocator.html" title="cpp/memory/scoped allocator adaptor/outer allocator"><span class="t-lines"><span>scoped_allocator_adaptor::outer_allocator</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="allocate.html" title="cpp/memory/scoped allocator adaptor/allocate"><span class="t-lines"><span>scoped_allocator_adaptor::allocate</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="deallocate.html" title="cpp/memory/scoped allocator adaptor/deallocate"><span class="t-lines"><span>scoped_allocator_adaptor::deallocate</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="max_size.html" title="cpp/memory/scoped allocator adaptor/max size"><span class="t-lines"><span>scoped_allocator_adaptor::max_size</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>scoped_allocator_adaptor::construct</span></span></strong></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="destroy.html" title="cpp/memory/scoped allocator adaptor/destroy"><span class="t-lines"><span>scoped_allocator_adaptor::destroy</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="select_on_container_copy_construction.html" title="cpp/memory/scoped allocator adaptor/select on container copy construction"><span class="t-lines"><span>scoped_allocator_adaptor::select_on_container_copy_construction</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 非成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator_cmp.html" title="cpp/memory/scoped allocator adaptor/operator cmp"><span class="t-lines"><span>operator==</span><span>operator!=</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> <a href="deduction_guides.html" title="cpp/memory/scoped allocator adaptor/deduction guides">推导指引</a><span class="t-mark-rev t-since-cxx17">(C++17)</span></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>定义于头文件 <code><a href="../../header/scoped_allocator.html" title="cpp/header/scoped allocator">&lt;scoped_allocator&gt;</a></code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1">&lt;</span> <span class="kw1">class</span> T, <span class="kw1">class</span>... <span class="me1">Args</span> <span class="sy1">&gt;</span><br>
<span class="kw4">void</span> construct<span class="br0">(</span> T<span class="sy2">*</span> p, Args<span class="sy3">&amp;&amp;</span>... <span class="me1">args</span> <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2, <span class="kw1">class</span>... <span class="me1">Args1</span>, <span class="kw1">class</span>... <span class="me1">Args2</span> <span class="sy1">&gt;</span><br>
<p><span class="kw4">void</span> construct<span class="br0">(</span> <a href="../../utility/pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1, T2<span class="sy1">&gt;</span><span class="sy2">*</span> p,<br>
                <a href="../../utility/piecewise_construct_t.html"><span class="kw1105">std::<span class="me2">piecewise_construct_t</span></span></a>,<br>
                <a href="../../utility/tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>Args1...<span class="sy1">&gt;</span> x,<br>
</p>
                <a href="../../utility/tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>Args2...<span class="sy1">&gt;</span> y <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2 <span class="sy1">&gt;</span><br>
<span class="kw4">void</span> construct<span class="br0">(</span> <a href="../../utility/pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1, T2<span class="sy1">&gt;</span><span class="sy2">*</span> p <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (3) </td>
<td> <span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2, <span class="kw1">class</span> U, <span class="kw1">class</span> V <span class="sy1">&gt;</span><br>
<span class="kw4">void</span> construct<span class="br0">(</span> <a href="../../utility/pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1, T2<span class="sy1">&gt;</span><span class="sy2">*</span> p, U<span class="sy3">&amp;&amp;</span> x, V<span class="sy3">&amp;&amp;</span> y <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (4) </td>
<td> <span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2, <span class="kw1">class</span> U, <span class="kw1">class</span> V <span class="sy1">&gt;</span><br>
<span class="kw4">void</span> construct<span class="br0">(</span> <a href="../../utility/pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1, T2<span class="sy1">&gt;</span><span class="sy2">*</span> p, <span class="kw4">const</span> <a href="../../utility/pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>U, V<span class="sy1">&gt;</span><span class="sy3">&amp;</span> xy <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (5) </td>
<td> <span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl t-until-cxx20">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> T1, <span class="kw1">class</span> T2, <span class="kw1">class</span> U, <span class="kw1">class</span> V <span class="sy1">&gt;</span><br>
<span class="kw4">void</span> construct<span class="br0">(</span> <a href="../../utility/pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>T1, T2<span class="sy1">&gt;</span><span class="sy2">*</span> p, <a href="../../utility/pair.html"><span class="kw1096">std::<span class="me2">pair</span></span></a><span class="sy1">&lt;</span>U, V<span class="sy1">&gt;</span><span class="sy3">&amp;&amp;</span> xy <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (6) </td>
<td> <span class="t-mark-rev t-until-cxx20">(C++20 前)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>用 <code>OuterAllocator</code> 与提供的构造函数参数在 <code>p</code> 所指向的分配但未初始化的存储构造对象。若对象是自身使用分配器的类型，或若它是 <code>std::pair</code> ，则下传 <code>InnerAllocator</code> 给构造的对象。
</p><p>首先，调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">this<span class="sy2">-</span><span class="sy1">&gt;</span>outer_allocator<span class="br0">(</span><span class="br0">)</span></span></span> 获得最外层分配器 <code>OUTERMOST</code> ，然后在此调用的结果上递归调用 <code>outer_allocator()</code> 成员函数直至抵达无这种成员函数的分配器。
</p><p>定义 <code>OUTERMOST_ALLOC_TRAITS(x)</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1">&lt;</span><a href="../../types/remove_reference.html"><span class="kw607">std::<span class="me2">remove_reference_t</span></span></a><span class="sy1">&lt;</span>decltype<span class="br0">(</span>OUTERMOST<span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span><span class="sy1">&gt;&gt;</span></span></span>
</p>
<div class="t-li1"><span class="t-li">1)</span> 以<a href="../uses_allocator.html#.E4.BD.BF.E7.94.A8.E5.88.86.E9.85.8D.E5.99.A8.E6.9E.84.E9.80.A0" title="cpp/memory/uses allocator">使用分配器构造</a>的手段在 <span class="t-spar">p</span> 所指示的未初始化内存位置，以 <span class="t-spar">OUTERMOST</span> 为分配器创建给定类型 <code>T</code> 的对象。在为 <code>T</code> 的构造函数所期待的使用分配器约定调整后，调用 <span class="t-c"><span class="mw-geshi cpp source-cpp">OUTERMOST_ALLOC_TRAITS<span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="sy4">::</span><span class="me2">construct</span></span></span> 。</div>
 <table class="t-rev-begin">
<tr class="t-rev t-until-cxx20"><td>
<div class="t-li1"><span class="t-li"></span> 此重载仅若 <code>U</code> 不是 <span class="t-lc"><a href="../../utility/pair.html" title="cpp/utility/pair">std::pair</a></span> 的特化才参与重载决议。
</div></td>
<td><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td></tr>
<tr class="t-rev t-since-cxx20"><td>
<div class="t-li1"><span class="t-li"></span> 等价于
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><a href="../../utility/apply.html"><span class="kw1103">std::<span class="me2">apply</span></span></a><span class="br0">(</span>
    <span class="br0">[</span>p,this<span class="br0">]</span><span class="br0">(</span><span class="kw4">auto</span><span class="sy3">&amp;&amp;</span>... <span class="me1">newargs</span><span class="br0">)</span> <span class="br0">{</span>
        OUTERMOST_ALLOC_TRAITS<span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span><span class="sy4">::</span><span class="me2">construct</span><span class="br0">(</span>
            OUTERMOST<span class="br0">(</span><span class="sy2">*</span>this<span class="br0">)</span>, p, <a href="../../utility/forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>decltype<span class="br0">(</span>newargs<span class="br0">)</span><span class="sy1">&gt;</span><span class="br0">(</span>newargs<span class="br0">)</span>...<span class="br0">)</span><span class="sy4">;</span>
    <span class="br0">}</span>,
    std<span class="sy4">::</span><span class="me2">uses_allocator_construction_args</span><span class="br0">(</span>
        inner_allocator<span class="br0">(</span><span class="br0">)</span>,
        <a href="../../utility/forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>Args<span class="sy1">&gt;</span><span class="br0">(</span>args<span class="br0">)</span>...
    <span class="br0">)</span>
<span class="br0">)</span><span class="sy4">;</span></pre></div></div>
</div></td>
<td><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></td></tr>
</table>
 <table class="t-rev-begin">
<tr class="t-rev t-until-cxx20"><td>
<div class="t-li1"><span class="t-li">2)</span> 首先，若 <code>T1</code> 或 <code>T2</code> 具分配器，则修改 <code>tuple</code> <code>x</code> 与 <code>y</code> 以包含适合的内层分配其，按照下列三条规则产生二个新的 <code>tuple</code> <code>xprime</code> 与 <code>yprime</code> ：</div>
<div class="t-li2"><span class="t-li">2a)</span> 若 <code>T1</code> 不具分配器 (<span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../uses_allocator.html"><span class="kw704">std::<span class="me2">uses_allocator</span></span></a><span class="sy1">&lt;</span>T1, inner_allocator_type<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span><span class="sy1">==</span><span class="kw2">false</span></span></span> ，则 <code>xprime</code> 是 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../utility/tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>Args1<span class="sy3">&amp;&amp;</span>...<span class="sy1">&gt;</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span></span></span> 。（亦要求 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="http://zh.cppreference.com/w/cpp/types/is_constructible"><span class="kw520">std::<span class="me2">is_constructible</span></span></a><span class="sy1">&lt;</span>T1, Args1...<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span><span class="sy1">==</span><span class="kw2">true</span></span></span> ）</div>
<div class="t-li2"><span class="t-li">2b)</span> 若 <code>T1</code> 具分配器 (<span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../uses_allocator.html"><span class="kw704">std::<span class="me2">uses_allocator</span></span></a><span class="sy1">&lt;</span>T1, inner_allocator_type<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span><span class="sy1">==</span><span class="kw2">true</span></span></span>) ，而其构造函数接收 <code>allocator_tag</code> (<span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="http://zh.cppreference.com/w/cpp/types/is_constructible"><span class="kw520">std::<span class="me2">is_constructible</span></span></a><span class="sy1">&lt;</span>T1, <a href="../allocator_arg_t.html"><span class="kw702">std::<span class="me2">allocator_arg_t</span></span></a>, inner_allocator_type<span class="sy3">&amp;</span>, Args1...<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span><span class="sy1">==</span><span class="kw2">true</span></span></span>) ，则 <code>xprime</code> 为
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><a href="../../utility/tuple/tuple_cat.html"><span class="kw1115">std::<span class="me2">tuple_cat</span></span></a><span class="br0">(</span><a href="../../utility/tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span><a href="../allocator_arg_t.html"><span class="kw702">std::<span class="me2">allocator_arg_t</span></span></a>, inner_allocator_type<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="br0">(</span>
                    <a href="../allocator_arg.html"><span class="kw703">std::<span class="me2">allocator_arg</span></span></a>, inner_allocator<span class="br0">(</span><span class="br0">)</span>
               <span class="br0">)</span>,
               <a href="../../utility/tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>Args1<span class="sy3">&amp;&amp;</span>...<span class="sy1">&gt;</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></pre></div></div></div>
<div class="t-li2"><span class="t-li">2c)</span> 若 <code>T1</code> 具分配器 (<span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../uses_allocator.html"><span class="kw704">std::<span class="me2">uses_allocator</span></span></a><span class="sy1">&lt;</span>T1, inner_allocator_type<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span><span class="sy1">==</span><span class="kw2">true</span></span></span>) ，且其构造函数接收分配器为尾参数 (<span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="http://zh.cppreference.com/w/cpp/types/is_constructible"><span class="kw520">std::<span class="me2">is_constructible</span></span></a><span class="sy1">&lt;</span>T1, Args1..., inner_allocator_type<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">value</span><span class="sy1">==</span><span class="kw2">true</span></span></span>) ，则 <code>xprime</code> 为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../utility/tuple/tuple_cat.html"><span class="kw1115">std::<span class="me2">tuple_cat</span></span></a><span class="br0">(</span><a href="../../utility/tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>Args1<span class="sy3">&amp;&amp;</span>...<span class="sy1">&gt;</span><span class="br0">(</span>std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span>, <a href="../../utility/tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;</span>inner_allocator_type<span class="sy3">&amp;</span><span class="sy1">&gt;</span><span class="br0">(</span>inner_allocator<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></span></span> 。</div>
<div class="t-li1"><span class="t-li"></span> 应用相同规则到 <code>T2</code> 并以 <code>yprime</code> 替换 <code>y</code> 。</div>
<div class="t-li1"><span class="t-li"></span> 一旦构造了 <code>xprime</code> 与 <code>yprime</code> ，则在分配器的存储构造 <code>pair</code> <code>p</code> ，通过调用
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><a href="../allocator_traits.html"><span class="kw701">std::<span class="me2">allocator_traits</span></span></a><span class="sy1">&lt;</span>O<span class="sy1">&gt;</span><span class="sy4">::</span><span class="me2">construct</span><span class="br0">(</span> OUTERMOST,
                                     p,
                                     <a href="../../utility/piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>,
                                     std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>xprime<span class="br0">)</span>,
                                     std<span class="sy4">::</span><span class="me2">move</span><span class="br0">(</span>yprime<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></pre></div></div></div>
<div class="t-li1"><span class="t-li">3)</span> 等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp">construct<span class="br0">(</span>p, <a href="../../utility/piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>, <a href="../../utility/tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;&gt;</span><span class="br0">(</span><span class="br0">)</span>, <a href="../../utility/tuple.html"><span class="kw1098">std::<span class="me2">tuple</span></span></a><span class="sy1">&lt;&gt;</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> ，即传递 <code>pair</code> 的成员类型上的内层分配器，若它们接受。</div>
<div class="t-li1"><span class="t-li">4)</span> 等价于
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1">construct<span class="br0">(</span>p, <a href="../../utility/piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>, <a href="../../utility/tuple/forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span><a href="../../utility/forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>U<span class="sy1">&gt;</span><span class="br0">(</span>x<span class="br0">)</span><span class="br0">)</span>,
                                       <a href="../../utility/tuple/forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span><a href="../../utility/forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>V<span class="sy1">&gt;</span><span class="br0">(</span>y<span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></pre></div></div></div>
<div class="t-li1"><span class="t-li">5)</span> 等价于
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1">construct<span class="br0">(</span>p, <a href="../../utility/piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>, <a href="../../utility/tuple/forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span>xy.<span class="me1">first</span><span class="br0">)</span>,
                                       <a href="../../utility/tuple/forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span>xy.<span class="me1">second</span><span class="br0">)</span><span class="br0">)</span></pre></div></div></div>
<div class="t-li1"><span class="t-li">6)</span> 等价于
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1">construct<span class="br0">(</span>p, <a href="../../utility/piecewise_construct.html"><span class="kw1106">std::<span class="me2">piecewise_construct</span></span></a>,
             <a href="../../utility/tuple/forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span><a href="../../utility/forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>U<span class="sy1">&gt;</span><span class="br0">(</span>xy.<span class="me1">first</span><span class="br0">)</span><span class="br0">)</span>,
             <a href="../../utility/tuple/forward_as_tuple.html"><span class="kw1114">std::<span class="me2">forward_as_tuple</span></span></a><span class="br0">(</span><a href="../../utility/forward.html"><span class="kw1117">std::<span class="me2">forward</span></span></a><span class="sy1">&lt;</span>V<span class="sy1">&gt;</span><span class="br0">(</span>xy.<span class="me1">second</span><span class="br0">)</span><span class="br0">)</span><span class="br0">)</span></pre></div></div></div>
</td>
<td><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></td></tr>
</table>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  p
</td>
<td> -
</td>
<td>  指向被分配但未初始化的存储的指针
</td></tr>
<tr class="t-par">
<td>  args...
</td>
<td> -
</td>
<td>  传递给 <code>T</code> 的构造函数的构造函数参数
</td></tr>
<tr class="t-par">
<td>  x
</td>
<td> -
</td>
<td>  传递给 <code>T1</code> 的构造函数的构造函数参数
</td></tr>
<tr class="t-par">
<td>  y
</td>
<td> -
</td>
<td>  传递给 <code>T2</code> 的构造函数的构造函数参数
</td></tr>
<tr class="t-par">
<td>  xy
</td>
<td> -
</td>
<td>  成员分别为 <code>T1</code> 与 <code>T2</code> 构造函数实参的 pair
</td></tr></table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
<p>（无）
</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
<p>此函数为任何给予了 <span class="t-lc"><a href="../scoped_allocator_adaptor.html" title="cpp/memory/scoped allocator adaptor">std::scoped_allocator_adaptor</a></span> 作为分配器使用的具分配器对象，例如 <span class="t-lc"><a href="../../container/vector.html" title="cpp/container/vector">std::vector</a></span> 所调用（通过 <span class="t-lc"><a href="../allocator_traits.html" title="cpp/memory/allocator traits">std::allocator_traits</a></span> ）。因为 <code>inner_allocator</code> 自身是 <span class="t-lc"><a href="../scoped_allocator_adaptor.html" title="cpp/memory/scoped allocator adaptor">std::scoped_allocator_adaptor</a></span> 的实例，此函数亦在具分配器对象通过此函数开始构造其自身成员时得到调用。
</p>
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。
</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th> DR
</th>
<th> 应用于
</th>
<th> 出版时的行为
</th>
<th> 正确行为
</th></tr>
<tr>
<td> <a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue2975">LWG 2975</a>
</td>
<td> C++11
</td>
<td> 某些情况下 pair 构造错误地使用第一重载
</td>
<td> 制约为不接受 pair
</td></tr>
<tr>
<td> <a rel="nofollow" class="external text" href="https://wg21.link/P0475R1">P0475R1</a>
</td>
<td> C++11
</td>
<td> pair 逐片构造可能复制参数
</td>
<td> 变换到引用的 tuple 以避免复制
</td></tr></table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../allocator_traits/construct.html" title="cpp/memory/allocator traits/construct"> <span class="t-lines"><span>construct</span></span></a></div><div><span class="t-lines"><span><span class="t-cmark">[静态]</span></span></span></div></div>
</td>
<td>   在分配的存储构造对象 <br> <span class="t-mark">(函数模板)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="../allocator/construct.html" title="cpp/memory/allocator/construct"> <span class="t-lines"><span>construct</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-deprecated-cxx17">(C++17 中弃用)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 中移除)</span></span></span></div></div>
</td>
<td>  在分配的存储构造对象 <br> <span class="t-mark">(<code>std::allocator&lt;T&gt;</code> 的公开成员函数)</span> </td></tr>
</table>

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